Curves: New tools for curves sculpt mode.

This commit contains various new features for curves sculpt mode
that have been developed in parallel.

* Selection:
  * Operator to select points/curves randomly.
  * Operator to select endpoints of curves.
  * Operator to grow/shrink an existing selection.
* New Brushes:
  * Pinch: Moves points towards the brush center.
  * Smooth: Makes individual curves straight without changing the root
    or tip position.
  * Puff: Makes curves stand up, aligning them with the surface normal.
  * Density: Add or remove curves to achieve a certain density defined
    by a minimum distance value.
  * Slide: Move root points on the surface.

Differential Revision: https://developer.blender.org/D15134

1 files changed, 20 insertions, 7 deletions

diff --git a/source/blender/editors/curves/intern/curves_ops.cc b/source/blender/editors/curves/intern/curves_ops.cc
index 25bcba6cfb3..dd7edf66920 100644
--- a/source/blender/editors/curves/intern/curves_ops.cc
+++ b/source/blender/editors/curves/intern/curves_ops.cc
@@ -72,7 +72,7 @@ static bool object_has_editable_curves(const Main &bmain, const Object &object)
   return true;
 }
 
-static VectorSet<Curves *> get_unique_editable_curves(const bContext &C)
+VectorSet<Curves *> get_unique_editable_curves(const bContext &C)
 {
   VectorSet<Curves *> unique_curves;
 
@@ -715,7 +715,7 @@ static void CURVES_OT_snap_curves_to_surface(wmOperatorType *ot)
                "How to find the point on the surface to attach to");
 }
 
-static bool selection_poll(bContext *C)
+bool selection_operator_poll(bContext *C)
 {
   const Object *object = CTX_data_active_object(C);
   if (object == nullptr) {
@@ -784,7 +784,7 @@ static void CURVES_OT_set_selection_domain(wmOperatorType *ot)
   ot->description = "Change the mode used for selection masking in curves sculpt mode";
 
   ot->exec = set_selection_domain::curves_set_selection_domain_exec;
-  ot->poll = selection_poll;
+  ot->poll = selection_operator_poll;
 
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 
@@ -820,13 +820,11 @@ static void CURVES_OT_disable_selection(wmOperatorType *ot)
   ot->description = "Disable the drawing of influence of selection in sculpt mode";
 
   ot->exec = disable_selection::curves_disable_selection_exec;
-  ot->poll = selection_poll;
+  ot->poll = selection_operator_poll;
 
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 }
 
-namespace select_all {
-
 static bool varray_contains_nonzero(const VArray<float> &data)
 {
   bool contains_nonzero = false;
@@ -841,6 +839,19 @@ static bool varray_contains_nonzero(const VArray<float> &data)
   return contains_nonzero;
 }
 
+bool has_anything_selected(const Curves &curves_id)
+{
+  const CurvesGeometry &curves = CurvesGeometry::wrap(curves_id.geometry);
+  switch (curves_id.selection_domain) {
+    case ATTR_DOMAIN_POINT:
+      return varray_contains_nonzero(curves.selection_point_float());
+    case ATTR_DOMAIN_CURVE:
+      return varray_contains_nonzero(curves.selection_curve_float());
+  }
+  BLI_assert_unreachable();
+  return false;
+}
+
 static bool any_point_selected(const CurvesGeometry &curves)
 {
   return varray_contains_nonzero(curves.selection_point_float());
@@ -856,6 +867,8 @@ static bool any_point_selected(const Span<Curves *> curves_ids)
   return false;
 }
 
+namespace select_all {
+
 static void invert_selection(MutableSpan<float> selection)
 {
   threading::parallel_for(selection.index_range(), 2048, [&](IndexRange range) {
@@ -924,7 +937,7 @@ static void SCULPT_CURVES_OT_select_all(wmOperatorType *ot)
   ot->description = "(De)select all control points";
 
   ot->exec = select_all::select_all_exec;
-  ot->poll = selection_poll;
+  ot->poll = selection_operator_poll;
 
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;